File



Patented July 6, 1920.

FILE.

C. 0. SCHNEIDER.

APPLICATION .man ocr. 14. 191s. 1,345,890.

@ATENE FFME.

UNITED STATES CHARLES OTTO SCHNEDER, 0F WIMBLEDON, LONDON, ENGLAND, .ASSET-.NOR TO THE PATENT FILE AND TOOL COMPANY LIMITED, 0F LONDON, ENGLAND.

FILE.

Application filed October 14, 1918.

To all 1li/tom t may concern.'

Be it known that I5 @Hannes (ljrro SCHNEIDER, a subject of the EmperorI o'l Germany7 residing in 73 Cromwell road, l@Vimbledon, London, S. W. 19, England, have invented certain new and useful improvements in and Relating to Files, ot which the following is a specification.

This invention relates to metal and like cutting ,files and it refers to files in which the teeth are of arcuate torni or are arrangeffl upon arcs oil circles exteinling across the tace of the lile.

ln tiles ot ordinary traan it has longheen recognized that the effective operation oit the lilo is considerably improved it the angle at which the cutting` edges meet the work varies throughout the length oi? the tile, in other words if the file has an increment cut.

rlhe present invention has for its object a tile having teeth which are of arcuate outline or teeth arranged upon arcs of circles the centers oi' which arcs are so disposed with regard to the center line of the tile that the angle at which the teeth meet the work is constantlyT changing, whereby the advantages of an increment cut are secured.

According' to this invention instead oi' the centers of the arcs being located upon the center line of the .tile they are disposed upon a line inclined with respect to said center line. rfhe line of the centers may he such that it hiserts the center line in the middle oi' the length of the tile or at any other point, or it may be disposed upon one side of said center line, and loe either wholly contained within the width of the ile or he pz'trtly or wholly outside thereof.

rThe teeth may either extend continuously across the face of the le or they may he :interrupted by straight diagonal curved or other cuts or channels provided at regular or irregular intervals in the length 0i' the le,

Speccaton of Letters Patent.

Patented July 6, 1920.

Serial No. 258,000.

The ycenters of the arcs may he either hehind or in front of the teeth.

fin order that the invention may he the better understood drawings are appended in which Figure l is a plan showing one form ot' the invention.

Figs. 2, 3 and 4t are views showing` modirations thereof. 4

teierringi' to the appended drawings rb 'indicatief-i the body ol the file and Y) the teeth which are oli arcuate outline extending uninterruptedly across the face of the file.

The teeth are all arcs ot circles of equal radii and the line of the centers ot said 'teeth are disposed upon the line which as will he seen is disposed at an angle relatively to the center line li/ i/ of the file. By this means the angle at which the teeth meet the work is constantly changing` through the stroke of the le.

in Figs. 2 to 4: the teeth are shown as interrupted hy means of diagonal cuts or grooves which may he either straight as indicated at c Fig. 2, or oiz substantially V shaped outline as at c1, Fig. 3 or again said cuts or channels may loe of curved outline as shown by c2 in Eig, 4i. rilhe cuts or channels Inay he disposed at regular or irregular intervals along` the length of the tile` Claim:

A file having teeth ot arcuate form estending` across the surface of the file, the generating` centers of the arcs of said teeth lying' on a line inclined to the axis of said tile.

.in testimony whereof affix my signature in the presence of two witnesses.

CHARLES OTTO SCHNEIDER.

Witnesses H. Pnrnn VENN, ARTHUR JAMES HALL. 

